cc: Remove opaque flags from SharedQuadState and DrawQuad

cc/scrollbar_layer_impl.cc

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/scrollbar_layer_impl.h"
 
 #include "cc/quad_sink.h"
 #include "cc/scrollbar_animation_controller.h"
 #include "cc/texture_draw_quad.h"
 #include "ui/gfx/rect_conversions.h"
@@ skipping 77 matching lines @@
 
     SharedQuadState* sharedQuadState = quadSink.useSharedQuadState(createSharedQuadState());
     appendDebugBorderQuad(quadSink, sharedQuadState, appendQuadsData);
 
     WebRect thumbRect, backTrackRect, foreTrackRect;
     m_geometry->splitTrack(&m_scrollbar, m_geometry->trackRect(&m_scrollbar), backTrackRect, thumbRect, foreTrackRect);
     if (!m_geometry->hasThumb(&m_scrollbar))
         thumbRect = WebRect();
 
     if (m_thumbResourceId && !thumbRect.isEmpty()) {
-        scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::create(sharedQuadState, scrollbarLayerRectToContentRect(thumbRect), m_thumbResourceId, premultipledAlpha, uvRect, flipped);
-        quad->setNeedsBlending();
+        gfx::Rect quadRect(scrollbarLayerRectToContentRect(thumbRect));
+        gfx::Rect opaqueRect;
+        scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::create(sharedQuadState, quadRect, opaqueRect, m_thumbResourceId, premultipledAlpha, uvRect, flipped);
         quadSink.append(quad.PassAs<DrawQuad>(), appendQuadsData);
     }
 
     if (!m_backTrackResourceId)
         return;
 
     // We only paint the track in two parts if we were given a texture for the forward track part.
-    if (m_foreTrackResourceId && !foreTrackRect.isEmpty())
-        quadSink.append(TextureDrawQuad::create(sharedQuadState, scrollbarLayerRectToContentRect(foreTrackRect), m_foreTrackResourceId, premultipledAlpha, toUVRect(foreTrackRect, boundsRect), flipped).PassAs<DrawQuad>(), appendQuadsData);
+    if (m_foreTrackResourceId && !foreTrackRect.isEmpty()) {
+        gfx::Rect quadRect(scrollbarLayerRectToContentRect(foreTrackRect));
+        gfx::Rect opaqueRect(contentsOpaque() ? quadRect : gfx::Rect());
+        quadSink.append(TextureDrawQuad::create(sharedQuadState, quadRect, opaqueRect, m_foreTrackResourceId, premultipledAlpha, toUVRect(foreTrackRect, boundsRect), flipped).PassAs<DrawQuad>(), appendQuadsData);
+    }
 
     // Order matters here: since the back track texture is being drawn to the entire contents rect, we must append it after the thumb and
     // fore track quads. The back track texture contains (and displays) the buttons.
-    if (!contentBoundsRect.IsEmpty())
-        quadSink.append(TextureDrawQuad::create(sharedQuadState, gfx::Rect(contentBoundsRect), m_backTrackResourceId, premultipledAlpha, uvRect, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    if (!contentBoundsRect.IsEmpty()) {
+        gfx::Rect quadRect(contentBoundsRect);
+        gfx::Rect opaqueRect(contentsOpaque() ? quadRect : gfx::Rect());
+        quadSink.append(TextureDrawQuad::create(sharedQuadState, quadRect, opaqueRect, m_backTrackResourceId, premultipledAlpha, uvRect, flipped).PassAs<DrawQuad>(), appendQuadsData);
+    }
 }
 
 void ScrollbarLayerImpl::didLoseContext()
 {
     m_backTrackResourceId = 0;
     m_foreTrackResourceId = 0;
     m_thumbResourceId = 0;
 }
 
 bool ScrollbarLayerImpl::Scrollbar::isOverlay() const
@@ skipping 75 matching lines @@
 {
     return m_owner->m_isCustomScrollbar;
 }
 
 const char* ScrollbarLayerImpl::layerTypeAsString() const
 {
     return "ScrollbarLayer";
 }
 
 }  // namespace cc